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IMPACTS AND MITIGATION MEASURES The Initial Study(IS) found that the proposed project would not be located in areas subject to ground-bome vibration or ground-borne noise.In addition,the proposed project would not include the development of land uses that would generate substantial ground-bome vibration or noise or require construction activities that would have such effects.The IS also found that the proposed project would not be located in the vicinity of an airstrip. Therefore,in accordance with Section 15063(b)(1)(C)of the State CEQA Guidelines,the potential for the proposed project to be located near or generate noise sources related to ground-borne sources or airstrips is not evaluated further in this EIR. See the IS(Appendix B of this Draft EIR)for further discussion. IMPACT Noise-Generation of Temporary Construction Noise. The proposed project could result in construction- 4.13.1 related noise between 9:00 p.m. and 6:00 a.m. that would exceed applicable County noise standards at nearby existing and proposed residential land uses.A significant impact could occur. Construction noise in any particular area would be temporary and would include noise from activities such as earth moving, grading,site preparation,truck hauling of material,pouring of concrete,and use of power hand - tools. Construction noise is typically intermittent and varies depending on the nature of the construction activities being performed.Noise generated by construction equipment, including excavation equipment,material handlers, ' and portable generators,can reach high levels for brief periods. When noise levels generated by construction operations are being evaluated,activities occurring during the more noise-sensitive evening and nighttime hours are of increased concern.Because exterior ambient noise levels typically decrease during the late evening and nighttime hours as community activities decrease(e.g.,reduced industrial activities and vehicle traffic), _ construction activities performed during these more noise-sensitive times can result in increased annoyance and potential sleep disruption to occupants of nearby residential dwellings. The U.S.Environmental Protection Agency(EPA)has found that the average noise levels associated with construction activities typically range from approximately 76 dBA to 84 dBA Ley,with intermittent individual equipment noise levels ranging from approximately 75 dBA to more than 88 dBA for brief periods.Table 4.13-6 lists typical uncontrolled noise levels generated by individual construction equipment at a distance of 50 feet. - Table 4.13-6 Noise Levels Generated by Typical Construction Equipment Type of Equipment Range of Sound Levels Suggested Sound Levels for Analysis (d6A at 50 feet) Pile driver 81-96 93 Rock drill 83-99 96 Jackhammer 75-85 82 Pneumatic tools 78-88 85 Pumps 68-80 77 Bulldozer 85-90 88 Tractor 77-82 80 Front-end loader 86-90 88 Hydraulic backhoe 81-90 86 Hydraulic excavator 81-90 86 Grader 79-89 86 Air compressor 76-86 86 Truck 81-87 86 Sources:EPA 1971,BBN Layman Miller 1987 EDAW College Park at Mountain House Specific Plan III Draft EIR - Noise 4.13-16 San Joaquin County